In its tradition year-end event in Las Vegas, the organization offers UFC 155, which features a rematch between UFC heavyweight champion Junior Dos Santos and ex-titleholder Cain Velasquez.

Check out a video preview of the stacked Dec. 29 event.

UFC 155 takes place at MGM Grand Garden Arena in Las Vegas. The pay-per-view main card follows prelims on FX and Facebook.

Dos Santos (15-1 MMA, 9-0 UFC) and Velasquez (10-1 MMA, 8-1 UFC) first fought a year ago at UFC on FOX 1, the UFC’s first network-televised event. However, the featured attraction of the one-hour special ended in just 64 seconds after Dos Santos knocked out then-champ Velasquez and took his title. Since then, Dos Santos defended his belt with a TKO of Frank Mir, and Velasquez earned his title shot with a dominant TKO win over Antonio “Bigfoot” Silva.

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